diff --git a/packages/sda/package.py b/packages/sda/package.py
index 3bb82653351034172b449626bbfad54f5fe9ef5e..ee1a09290c2476efbb9a799163d2490d5c6b2fb6 100644
--- a/packages/sda/package.py
+++ b/packages/sda/package.py
@@ -27,7 +27,7 @@ class Sda(MakefilePackage):
     version('7.3.3d', sha256='295ca0142532759a43375422a4ebc050e15b1c248e45493f5864765a9fe8076f')
 
     # Dependencies.
-    depends_on('gcc@9.4.0:')
+    depends_on('%gcc@9.4.0:')
     depends_on('python@3.8:', type=('build','run'))
     conflicts('%intel')